Artifacts in Volume

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i have a weird problem. When i render a cloud with depth map shadows everything looks great in render view.But when i render about mantra node to hard disk there a some artifacts. fThe Light setup is a sun light and a shadow map of 4k. I changed every settings in the shadow tab, like bias,blur,quality... But nothing happen.When i change the light position, the artifacts appear on a other place. So i think there is something wrong with the light.

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i've found renderview doesn't always do the correct pre-processing. for example, if you have a geometry light that uses point-clouds, it won't recompute the point cloud if you change settings. could be something similar with generating depth maps. try stopping and restarting the render to force a refresh.